Legio I Sicilianus

Legio I Sicilianus was a legion of the Roman Republic and Roman Empire raised in 41 BC. Formerly known as Legio I Concordialis, it was renamed during Octavian's campaign against Sextus Pompeius in Sicily. The legion saw combat in several theaters, ranging from Sicily to North Africa to Asia Minor, and from the islands of Sardinia to Cyprus.

History
Legio I Concordialis was founded by Octavian in Roma, Latium in 41 BC, and it consisted of the best soldiers in the Roman army, as they came from the capital and included First Cohort elite legionary troops. Legio I Concordialis was joined by the veteran Appius Calavius Drusus, who trained the soldiers. It marched south to fight against Sextus Pompeius in Sicily, and the legion was renamed "Sicilianus" due to its first campaign being in Sicily against Pompey's Rome. The Sicilian Legion conquered Sicily from Pompey and proceeded to sail to North Africa to fight Marcus Aemilius Lepidus, conquering the city of Carthage before seizing more cities under Lepidus' control in the area. Later, it returned to Sicily when Pompey recaptured the island, and Octavian won a great victory at the Battle of Syracuse despite facing a larger Pompeian army. The Legion proceeded to conquer the Mediterranean Sea islands from Lepidus, and the legion was later sent to take Crete and other eastern Mediterranean positions from Mark Antony's forces.